Benzene is an aromatic hydrocarbon: a colourless, sweet-smelling liquid and an established carcinogen, classified among the most hazardous volatile organic compounds. In foods it occasionally appears as a contaminant, most famously when benzoate preservatives react with ascorbic acid in soft drinks under heat and light, a discovery that prompted industry reformulation and tighter controls. It can also arise from environmental pollution near industrial sites or from packaging interactions. Strict limits, raw-material screening, and monitoring keep dietary exposure minimal, and beverage makers now design formulations and storage to prevent the benzoate-ascorbate reaction that creates this unwanted contaminant.